A 34-year-old man named Mark seeks counseling at a mental health clinic, expressing concerns about his difficulties with interpersonal relationships. He describes feeling constantly on guard and suspicious of others, but also mentions occasional episodes of increased energy that seem to "come out of nowhere."

Mark describes how during these episodes of increased energy, his mood is improved, and he feels much more confident, talkative, and driven. He also mentions that during these episodes, he has a decreased need for sleep and feels like he can accomplish anything he sets his mind to. Although Mark actually wishes these feelings would last longer, the episodes never seem to last longer than a day or two.

However, Mark's primary concern remains his persistent mistrust and suspicion of others. He reports feeling on guard and needing to carefully monitoring his surroundings and interactions with others because people are "plotting against" him. For example, he avoids sharing anything about his personal life with his colleagues as he thinks they will blackmail him. Mark also tends to hold grudges and has difficulty letting go of these perceived betrayals.

Mark identified that there are times when his mistrust of others has caused misunderstandings and conflicts in his relationships. He recalled how one time he thought his co-worker was trying take advantage of him, but later learned that they were looking to see if he was interested in joining their trivia team.

Within the context of therapy, Mark has slowly been able to acknowledge the impact that this persistent mistrust has had on his overall well-being. He's also become increasingly aware of how it has created a cycle of suspicion, anxiety, and isolation, leading to increased stress, tension, and difficulty in forming close connections with others. He described his tendency to distance himself from others as contributing to a "vicious cycle" of mistrust and second-guessing that he can't break free from. What psycological disorder(s) is Mark suffering from?